Manufacturers of car-infotainment systems can now reduce the cost and size of their products by utilising a new series of highly integrated automotive-grade power-management devices from STMicroelectronics. The series incorporates multiple voltage regulators on a single die. Automotive-qualification (AEC Q100) allows the devices for use in any car electronic systems.
The first member of the new series, the L5963, integrates two switching regulators for step-down DC-DC conversion, a linear low-dropout regulator, and a high-side driver. The L5963 leverages ST’s state-of-the-art BCD8s Automotive process technology with Deep Trench Isolation (DTI).
BCD (Bipolar-CMOS-DMOS) is a technology used by ST that allows low-voltage and high-voltage devices to be integrated on the same chip. This allows all of the three integrated voltage regulators can be directly connected to the vehicle battery without any intermediate circuitry, while the DTI technology increases the isolation between internal blocks and reduces interferences among them.
The high level of integration and the BCD technology eliminate the need to use pre-regulators between the battery and the voltage regulators and allow customers to reduce cost and PCB area by using a single device instead of multiple voltage regulators.
The L5963 provides a compact solution with three voltage regulators in one small (PSSO36) package. Maximum flexibility is offered as all regulators can be directly connected to the car battery, with their output voltages determined by simple resistor-resistor external components, while each regulator can be independently enabled or disabled via hardware pins.
Other features and benefits include a high switching frequency up to 2MHz that minimises the size of external components, high current capability (up to 3A for each DC-DC regulator) to meet the needs of demanding automotive applications, low power dissipation with a high efficiency of more than 90 per cent at 250kHz, and extremely low quiescent current (25μA typ.) in standby mode, essential for automotive applications when subsystems are always connected to the vehicle battery.
In addition, the solution offers a 500mA integrated high-side driver for protected connection of sub-systems to the vehicle battery. EMI emissions are minimized by a 180° phase shift between the DC-DC regulators.
Two PSSO36 package options are offered – slug down for low-power applications and slug up for higher-power applications where a heat-sink is needed. Samples of the L5963 are available.